Athlon XP 2100+ vs Atom E660
Athlon XP 2100+
Atom E660
Performance Spectrum - CPU
About PassMark
PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (PassMark) per dollar. Components placed above yours deliver better value for money. The Athlon XP 2100+ is positioned at rank 1139 and the Atom E660 is on rank 743, so the Atom E660 offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar Athlon XP 2100+
Performance Per Dollar Atom E660
Performance Comparison
About PassMark🏆 Chipversus Verdict
🚀 Performance Leadership
| Insight | Athlon XP 2100+ | Atom E660 |
|---|---|---|
| Gaming | ✅ Superior gaming performance | ❌ Lower gaming performance |
| Workstation | ❌ Weaker in multi-core tasks | ✅ Better multi-core power |
| Price | ⚠️ Higher cost ($30) | ✅ More affordable ($0) |
| Longevity | 🛑 Legacy (Thoroughbred (2001−2002) / 180 nm) | 🛑 Legacy (Tunnel Creek (2010) / 45 nm) |
💎 Value Proposition
| Insight | Athlon XP 2100+ | Atom E660 |
|---|---|---|
| Cost Efficiency | ❌ Lower cost efficiency | ❌ Lower cost efficiency |
| Upfront Cost | ⚠️ Higher cost ($30) | ✅ More affordable ($0) |
Performance Check
To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.
Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.
Technical Specifications
Side-by-side comparison of Athlon XP 2100+ and Atom E660
Athlon XP 2100+
The Athlon XP 2100+ is manufactured by AMD. It was released in 2009-01-01. It is based on the Thoroughbred (2001−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.73 GHz. L3 cache: 0 kB. L2 cache: 256 kB. Built on 180 nm process technology. Socket: A. Thermal design power (TDP): 72 Watt. Passmark benchmark score: 265 points. Launch price was $149.
Atom E660
The Atom E660 is manufactured by Intel. It was released in 14 September 2010 (15 years ago). It is based on the Tunnel Creek (2010) architecture. It features 1 cores and 2 threads. Max frequency: 1.3 GHz. L3 cache: 0 kB. L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: BGA676. Thermal design power (TDP): 3 Watt. Memory support: DDR2. Passmark benchmark score: 275 points. Launch price was $54.
Processing Power
The Athlon XP 2100+ packs 1 cores / 1 threads, matching the Atom E660's 1 cores. Boost clocks reach 1.73 GHz on the Athlon XP 2100+ versus 1.3 GHz on the Atom E660 — a 28.4% clock advantage for the Athlon XP 2100+. The Athlon XP 2100+ uses the Thoroughbred (2001−2002) architecture (180 nm), while the Atom E660 uses Tunnel Creek (2010) (45 nm). In PassMark, the Athlon XP 2100+ scores 265 against the Atom E660's 275 — a 3.7% lead for the Atom E660. Both processors carry 0 kB of L3 cache.
| Feature | Athlon XP 2100+ | Atom E660 |
|---|---|---|
| Cores / Threads | 1 / 1 | 1 / 2 |
| Boost Clock | 1.73 GHz+33% | 1.3 GHz |
| L3 Cache | 0 kB | 0 kB |
| L2 Cache | 256 kB | 512 kB (per core)+100% |
| Process | 180 nm | 45 nm-75% |
| Architecture | Thoroughbred (2001−2002) | Tunnel Creek (2010) |
| PassMark | 265 | 275+4% |
Memory & Platform
The Athlon XP 2100+ uses the A socket (PCIe 1.1), while the Atom E660 uses BGA676 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR-266 on the Athlon XP 2100+ versus DDR2-800 on the Atom E660 — the Atom E660 supports -203% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Athlon XP 2100+ supports up to 4 GB of RAM compared to 2 GB — 66.7% more capacity for professional workloads. Both feature 1-channel memory with ECC support. PCIe lanes: 0 (Athlon XP 2100+) vs 4 (Atom E660) — the Atom E660 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD Socket A (Athlon XP 2100+) and Intel FCBGA518 (Atom E660).
| Feature | Athlon XP 2100+ | Atom E660 |
|---|---|---|
| Socket | A | BGA676 |
| PCIe Generation | PCIe 1.1 | PCIe 2.0+82% |
| Max RAM Speed | DDR-266 | DDR2-800 |
| Max RAM Capacity | 4 GB+100% | 2 GB |
| RAM Channels | 1 | 1 |
| ECC Support | ✅ | ❌ |
| PCIe Lanes | 0 | 4 |
Advanced Features
The Atom E660 includes integrated graphics (Intel GMA 600), while the Athlon XP 2100+ requires a dedicated GPU.
| Feature | Athlon XP 2100+ | Atom E660 |
|---|---|---|
| Integrated GPU | No | Yes |
| IGPU Model | — | Intel GMA 600 |
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